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DEBT (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Contractual obligation, fiscal year maturity schedule
Carrying value of the Notes:
(in thousands)September 30, 2021December 31, 2020
Principal$600,000 $600,000 
Unamortized debt discount— (71,222)
Unamortized issuance costs(10,231)(10,575)
Convertible senior notes, net$589,769 $518,203 
Conversion options$— $84,120 
Issuance costs— (2,037)
Deferred taxes— (20,479)
Additional paid-in capital$— $61,604 

Interest expense related to the Notes:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in thousands)2021202020212020
Contractual interest expense (0.75% coupon)
$1,125 $1,125 $3,375 $2,700 
Amortization of debt discount
— 3,807 — 9,060 
Amortization of issuance costs
677 565 2,025 1,345 
$1,802 $5,497 $5,400 $13,105 
The effective interest rate for the Notes:
Nine Months Ended
September 30,
20212020
Weighted-average effective interest rate1.2 %4.3 %
Future payments of principal and contractual interest:
September 30, 2021
(in thousands)PrincipalInterestTotal
Remainder of 2021$— $— $— 
2022— 4,500 4,500 
2023— 4,500 4,500 
2024— 4,500 4,500 
2025600,000 1,488 601,488 
$600,000 $14,988 $614,988 
Schedule of derivative instruments Change in capped call transactions:
Nine Months Ended
September 30,
(in thousands)20212020
January 1,$83,597 $— 
Issuance— 51,900 
Fair value adjustment(7,543)19,816 
September 30,$76,054 $71,716